If x/a(cos A)+y/b(sin A)=1 and x/a(sin A)-y/b(cos A)=1 then prove that x^2/a^2+y^2/b^2=2.

If x/a(cos A)+y/b(sin A)=1 and x/a(sin A)-y/b(cos A)=1 then prove that

1.	If x/a(cos A)+y/b(sin A)=1 and x/a(sin A)-y/b(cos A)=1 then prove that x^2/a^2+y^2/b^2=2.
Answer» On squaring and then adding